CollectionUtils example for intersect using select and selectRejected.

CollectionsUtilsSelectExample.java

package com.charter.aesd.account.core.query;

import com.charter.aesd.device.domain.Device;
import org.apache.commons.collections.CollectionUtils;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Created by rhasija on 11/3/15.
 */
public class DeviceTest {

    public static void main(String[] args) {
        final List<String> macAddresses1 = Arrays.asList("1", "2", "3", "4", "5", "6", "7", "8");
        final List<String> macAddresses2 = Arrays.asList("1", "2", "3", "44", "5", "6", "7", "8");
        final List<Device> devices1 = createDevices(macAddresses1);
        final List<Device> devices2 = createDevices(macAddresses2);
        final List<Device> finalResult = new ArrayList<>();
        // Get all devices from devices2 that are same as devices1
        CollectionUtils.select(devices2, o -> {
            Device device = (Device) o;
            return devices1.stream().filter(device1 -> device1.getMacAddress().equals(device.getMacAddress())).findAny().isPresent();
        }, finalResult);

        CollectionUtils.selectRejected(devices2, o -> {
            Device device = (Device) o;
            return devices1.stream().filter(device1 -> device1.getMacAddress().equals(device.getMacAddress())).findAny().isPresent();
        }, finalResult);

        finalResult.forEach(device -> System.out.println(device.getMacAddress()));
    }

    static List<Device> createDevices(List<String> macAddresses) {
        return macAddresses.stream().map(macAddress -> {
            final Device device = new Device();
            device.setMacAddress(macAddress);
            return device;
        }).collect(Collectors.<Device>toList());
    }
}